The election on Tuesday of five new women to the U.S. Senate, four of them Democrats, will bring to 20 the number of "gentle ladies" in the 100-member body.

With the retirements of Republican Sens. Kay Bailey Hutchison of Texas and Olympia Snowe of Maine, the steady increase in numbers of Senate women had been expected to stop in 2012. Not so, and the women elected in campaign 2012 are a diverse lot in background and ideology.

The net result is three more women senators.

Sen.-elect Elizabeth Warren, D-Mass., is a high-profile Harvard Law School professor and architect of the Wall Street reform package and new consumer agency passed by Congress in 2010. Sen.-elect Deb Fischer, R-Neb., is a rural state legislator from western Nebraska who beat two better-financed opponents in the GOP primary and easily defeated former Sen. (and Gov.) Bob Kerrey in the general election.

Sen.-elect Tammy Baldwin, D-Wis., is the first openly gay woman to serve in the "World's Greatest Deliberative Body." Sen.-elect Mazie Hirono, D-Hawaii, held the annual Netroots Nation conference rapt earlier this year with the tale of her mother escaping an abusive marriage in Japan and making a new life for herself and her offspring in Hawaii.

The last Senate seat decided on Tuesday was North Dakota. Considered a sure Republican pickup, it was held for the Democrats by former state Attorney General Heidi Heitkamp, who won despite the fact that Mitt Romney was piling up nearly 60 percent of the state's vote.

Sen. Claire McCaskill, D-Mo., considered a goner in the summer, won a sweeping victory after her Republican challenger Todd Akin made a notorious statement that women's bodies can shut down pregnancy when they become victims of "legitimate" rape. Mitt Romney handily won in Missouri.

Just over a quarter-century ago, in 1986, Sen. Barbara Mikulski, D-Md., became the first woman elected to the Senate whose spouse had not served before her in Congress. The "year of the women," 1992, brought Feinstein and Sen. Barbara Boxer, D-Calif., and Sen. Patty Murray, D-Wash., to the Senate, where they continue to serve.

Washington and California are the two states in which women hold both U.S. Senate seats. With the election of two Democratic women to the U.S. House of Representatives, New Hampshire became the first state to have an all-female House delegation.